Question

найдите корень уравнения 0,6(x - 2 + 4,6 равно 0,4(7 + x) ;2) (x - 1)/(5-x) равно 2/9

Answer 1

Пошаговое объяснение:

1.

$0.6(x - 2 + 4.6) = 0.4(7 + x) \\ 0.6(x + 2.6) = 2. 8 + 0.4x \\ 0.6x + 1.56 - 0.4x = 2.8 \\ 0.2x = 2.8 - 1.56 \\ 0.2x = 1.24 \\ x = 6.2$

2.

$\frac{x - 1}{5 - x} = \frac{2}{9} \\ \\ 9(x - 1) = 2(5 - x) \\ 9x - 9 = 10 - 2x \\ 9x + 2x = 10 + 9 \\ 11x = 19 \\ x = \frac{19}{11}$